Tool retainer



TOOL RETAINER Filed oct. 1o 1921 aINI/ISNTOR.

Patented Apr. 13,

UNITED STATES 1,580,599 PATENT OFFICE.

HJALMER C. GUSTAFSON, F DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCK DRILL MANUFACTURING COMPANY, OF DENVER, COLORADO, A yCORPORil-SJIEIOIT 0F DELAWARE.

TOOL RETAINER.

Application filed October 10, 1921.

To all whom 17mg/ concern: v

Be it known that I, HJALmm C. GUsrAF son, a. Vcitizen ot the United States, residing at Denver, in the count-y of Denver and State ot Colorado, lhave invented certain new and useful Improvements in Tool Retainers, of? which the following is a specification.

The present invention relates to tool retainers for rock drills and the like, the object being to provide a novel device ot' this character, so constructed that the toolretaining means is housed, thereby protecting the same against external injury, and yet being readily operable to release the tool.

In the accompanying drawings Figure 1 is a plan view of the preferred embodiment of the invention.

Figure 2 is a longitudinal sectional view therethrough Figure 3 is a iront elevation of the holding dog,

Figure 4; is a rearl elevation of the saine, and `v Figure 5 is a plan View of said holding dog.

In the embodiment disclosed the front head of a hammer drill is shown at 6, and contains the usual tool holder in the form of a rotatable chuck 7 actuated by the piston hammer S, and having a bore or socket 9 to receive the tool. A portion of said tool in the 'form of a drill steel is illustrated at 10, said steel having a collar 11 thereon.v

The front end ot' the head 6 is reduced, as shown at 12 to form an annular seat that receives the rear end oft a hood or housing 13. The front wall 11i of said hood or hous ing has an opening 15 to permit the passage of the steel into the socket 9, and this opening is of sutlicient size to also permit the passage ot the collar 11. The inner front end of the housing is provided with rounded seats 16, against which knuckle holding dogs 17 having outstanding finger pieces 18 that pass through openings 19 formed in opposite sides of the hood or housing. These dogs incline inwardly and rearwardly and terminate in abutment shoulders 2O that are adapted to engage the i''ront side of the steel collar 11. A coiled spring 21 is located in the hood or housing and is interposed between the dogs and the front end of the head 6, the spring as 'clear- 'vance of the collar.

Serial No. 506,731.

ly shown in Figure 2 surrounding the steel and hearing against bot-h dogs. Y l

It will be clear that with this construction the drill steel can he passed through the opening and vinto the .socket 9 of the chuck 7. The coll arll forces the dogs apart and said dogs seatagainst the steel in ad- The steel is thus automatically locked in place, but is permitted to have the necessary play. To detach the steel it is only necessary to move the finger pieces forwardly, whereupon the dogs Vwill swing outwardly, as indicated in dotted lines and permit the collar to'pass between them.

The mounting` for the hood 13A comprises rearwardly extending rodsQQ forming a part of said hood and slidably engaging in oppositely projecting ears 23 formed on the frontend of the tool holder 6. These rods have retaining nuts 24.011 their rear ends and interposed between said nuts and ears 23 are. relatively heavy springs 25 that serve to yieldingly hold the hood in its rearmost positron and yet permit a yielding forward movement thereof.

Frein the foregoing, it is thought that the construction, operation and many advantages ot the herein described invention will be appa-rent to those skilled in the art, wit-hout further description, and it will he understood that vaious changes in the size, shape, proportion and minor details of construction, may he resorted to without departing from the spirit or sacrilicing any of the advantages of the invention.

Having thus fully described my invention, what 'l cla-im as new, and desire to secure liv Letters 1Qatent, is

lpThe combination with a. tool holder having socket in its front end and outstanding side earS, a hood in advance of the holder having an opening' a-lined with the socket and rearwardly extending rods slidf able. in the ears, springs on the rods for urging the hood rearwardly, dogs pivotally mounted in the hood and having projecting' operating elements, said dogs having bearings at their'tront ends against the hood and having abutment shoulders in rear of said hearings for engagement with the i'ront tace oil? the collar ot' the Vtool placed in the socket, and a coiled spring in the hood interposed between the dogs and holder.

2. The vcombination with a. too-l holuer having a tool-receiving socket, of a hood llO mounted on the front end ot the holder and having a front wall provided with an opening through which the tool passes, and holding dogs pivotallv bearing against the front Wall ol' the hood on opposite sides of the opening7 said dogs having operating elements on the opposite sides of the hood and having abutment faces at their rear ends ior engagement with the. front face of the collar ot a tool placed in the socket.

SpThe combination with L tool holder having a tool-receiving,l socket, and oppositely projecting ears, oit' L hood having rearu'ardly extending rods slidable in the ears, retaining' devices on the rear ends of the rods, coiled springs on the rods between the ears and retaining device, said hood having a front Wall provided with an opening through which the tool passes, holding` dogs pivotally bearing at their front ends against the front wall ot the hoodon opposite sides of the opening, said dogs having operating elements on the opposite sides of the hood, and having their rear ends provided with abutment faces to engage the ront face ot the collar of a tool placed in the socket, and a coiled spring interposed between the rear ends of the dogs outside the abutment faces and the front end of the tool holder and serving to swings,- said dogs to their forward and inner positions.

4. The combination with a tool holder havingl e tool-receiving socket, of a hood nionnted on the front end of the holder and having n tool-receiving opening alined with the socket, said'liood having a. front rounded Wall constituting pivot bearings, holding;` dogs within the hood having rounded iront ends pivotalh/ engaged in the bearings and having` operating,` elements projectingv outv-.nrdlxT from their rear ends7 the renr ends of said dogs being provided with abutment i'aces igor engagement `with the front t'ace ot' the coller ot a tool placed in the socket, and

opening means t'or normally holdii'ig the v dogs in their innermost relation.

ln testimony whereof, l al'lix my signa ture.

.HJALMER C. GUFAFSON. 

